claude-code/docs/diagrams/agent-loop.mmd

flowchart TB
    START((输入)) --> CTX["Context 管理"]
    CTX --> PRE["Pre-sampling Hook"]
    PRE --> LLM["LLM 流式输出"]
    LLM --> TC{tool_use?}

    TC --> |是| PERM{需权限?}
    PERM --> |是| USER["👤 用户审批"]
    USER --> |allow| TOOL_PRE
    USER --> |deny| DENIED["拒绝"]
    PERM --> |否| TOOL_PRE["Pre-tool Hook"]
    TOOL_PRE --> EXEC["并发执行工具"]
    EXEC --> TOOL_POST["Post-tool Hook"]
    TOOL_POST --> CTX
    DENIED --> CTX

    TC --> |否| POST["Post-sampling Hook"]
    POST --> STOP{"Stop Hook"}
    STOP --> |不通过| CTX
    STOP --> |通过| BUDGET{"Token Budget"}
    BUDGET --> |继续| CTX
    BUDGET --> |完成| DONE((完成))

    subgraph SUB["子 Agent"]
        FORK["AgentTool"] --> RECURSE["递归调用"]
    end

    EXEC -.-> FORK

    classDef proc fill:#eef,stroke:#66c,color:#224
    classDef decision fill:#fee,stroke:#c66,color:#422
    classDef hook fill:#ffe,stroke:#cc6,color:#442
    classDef io fill:#eff,stroke:#6cc,color:#244
    classDef sub fill:#efe,stroke:#6a6,color:#242

    class CTX,LLM,EXEC proc
    class TC,PERM,STOP,BUDGET decision
    class PRE,TOOL_PRE,TOOL_POST,POST hook
    class START,DONE,USER,DENIED io
    class FORK,RECURSE sub